Cracking solvent naphtha



F. E. DODGE.

CRACKING SOLVENT NAPHTHA.

APPLICATION FILED JULY I7, 1918.

1,409,893, Patented Mar. 14, 1922 UNITED STATESiPATENT OFFICE.

FRANK E. DODGE, OEFLUSHING, NEW YORK, A SSIGNOR TO THE BARRETT COMPANYA. CORPORATIOE' OF NEW JERSEY. I 1

onaoxme SOLVENT mrn'rna.

neoases.

Patented Mar. 14, 1922.

Application filed Jul 17,1918. Serial m. 245,380..

To all whom it may concern:

Be it known that I, FRANK E. DODGE, a citizen of the United States,residing at Flushing, in the county of Queens and State of New York,have invented certain new and useful Improvements in Cracking SolventNaphtha, of which the following is a specification.

This invention relates to a process of heating hydrocarbons of highboiling points in order to obtain valuable hydrocarbons of lower boilingpoints. It relates more specifically to the heating of solvent naphthainorder that its constituents may be cracked to roduce benzol, or toluol,or both.

he invention may be-conveniently carried out by passing the solventnaphtha, or other hydrocarbon which it is desired to crack, over thesurface of highly heated coke which remains in the ovens at or near theend of the coking operation in the usual gasmaking or coke-producingoperations.

The invention will be readily understood from the accompanying somewhatdiagrammatic drawing in which,

Fig. 1 is a longitudinal section through an oven, and,

Fi 2 is a section taken along the line A- of Fig. 1.

In these drawings, reference character 1 represents a horizontal oventhat may be charged with a charge of coal 2 through 1nlets 3. Outlet forthe coke which has been produced by the coking operation is shown at 4.Means for heating the oven 1 are shown at 5, 6 and 7. 5 is the fuel gasmains, 6 are the fines in which the gas is burned, and 7 are theregenerators which alternately are heated by the products of combustionand heat the air used to burn the gas, in the well known manner.

A rece tacle 10, for solvent na htha or other. hy rocarbon to becracked, as leading from it pipe 11 closedby valve 12. The pipe 11extends into the upper portion of oven 1. The pipe 13 for gases leads tomain 14: from the upper portion of oven 1.

The operation is as follows: Goal 2 is charged into the oven 1 throughinlets 8. The oven 1 is heated as is usual in the ordinary processes ofgas manufacture and coke making. The volatile constituents pass 01fthrough pipe 13 into main 1 1 from which the gases are passed throughthe usual scrubbers, etc., to render them suitable for use.

but may be carried out by a slight addition to apparatus already in use.It does not require a substantial increase in the amount of heatused incoking or gas-making operations, as the hot mass of coke remalning atthe end of the ordinary coking process contains enough heat to crack asubstantial amount of solvent naphthas. Just before the coking operationhas been entirely completed the valve 12 may be closed, and after thecoking operation is completed the mass is removed through outlet 4 and anew charge of coal isintroduced through inlets- 3 and the same process,as above described, is repeated with the fresh batch.

Solvent naphthas consist largely of xylenes and some mesitylenes which,upon being subjected to the high temperature in oven I, lose one or moreCH groups, bein thereby converted into toluol or benzo The solventnaphthas which are heated by this process may be obtained from anyconvenient source, such as the destructive distillation of coal. Anyportion of the naphthas which may have passed throu'h unchanged and beencollected, may 3 separated from the benzol and toluo again passedthrough the heated space in order to be cracked.

It is to be understood that instead of passing the naphthas over thecoke inthe oven where it has been produced, the coke may first beremoved to a different closed chamber where the naphthas may be passedover its surface while it is still hot, in order to crack the naphthas.

Claims:

1. The process of cracking solvent naphthas which consists in assmg saidnaphthas over the surface of coke near the end of the coking operationwhile'the temperature is about 600 C. to 800 C.

2. The herein described process which comprises the steps of introducingaromatic hydrocarbons of high boiling points into the hot space abovecoke in a coke oven While the temperature is about 600 C. to 800 C.

and collecting the products.

3. The process of cracking solvent naph' thas which consists inintroducing said naphthas into the upper portion of a coke oven afterthe coal therein has been substantially coked, and While'the temperatureis about 600 to 800 0.

4. The herein described'proce'ss of producing benzol and toluol' whichcomprises the steps of introducing solvent naphthas into the heatedspace above the hot coke in a coke oven while the temperature is about600 C. to 800 C. and collecting the products thereby formed.

5. The herein described process of producing benzol and toluol whichcomprises the steps of introducing xylol into the about 600 to 800 C.

7 The herein described process" of producing benzol and toluol whichcomprises the steps of introducing xylol and mesitylene into the heatedspace abovethehotcoke in av coke oven and collecting the productsthereby formed while the temperature is about 600 C. to 800 C. t

In testimony whereof I afiix my si nature;

FRANK E.'DO GE.

